Conditionally immortalized retinal capillary endothelial cell lines (TR-iBRB) expressing differentiated endothelial cell functions derived from a transgenic rat

Exp Eye Res. 2001 Feb;72(2):163-72. doi: 10.1006/exer.2000.0941.


The objective of this study was to establish and characterize a retinal capillary endothelial cell line (TR-iBRB) from a newly developed transgenic rat harboring the temperature-sensitive simian virus 40 (SV 40) large T-antigen gene (Tg rat). Retinal capillary endothelial cells were isolated from a Tg rat and cultured in collagen-coated dishes at 37 degrees C for a period of 48 hr. Cells were subsequently cultured at 33 degrees C to activate the large T-antigen. At the third passage, cells were cloned by colony formation and isolated from other cells. Nine immortalized cell lines of retinal capillary endothelial cells (TR-iBRB1 approximately 9) were obtained from a Tg rat. These cell lines had a spindle-fiber shape morphology, expressed the typical endothelial marker, von Willebrand factor, and internalized acetylated-low density lipoprotein. Moreover, vascular endothelial growth factor (VEGF) receptor-2 was expressed in TR-iBRBs. TR-iBRBs expressed a large T-antigen and grew well at 33 degrees C with a doubling time of 19-21 hr. In contrast, cells did not grow at 37 and 39 degrees C due to the reduced expression of large T-antigen, supporting temperature-dependent cell growth. TR-iBRBs expressed GLUT1 and exhibited 3- O -methyl- D -glucose (3-OMG) uptake activity. This 3-OMG uptake was saturable with a Michaelis-Menten constant of 5.56 +/- 0.51 m M and a maximum uptake rate of 45.3 +/- 2.6 nmol min(-1) mg protein(-1). P-Glycoprotein, with a molecular weight of approximately 180 KDa, was expressed in TR-iBRBs. In addition, mdr 1a, mdr 1b and mdr 2 were detected in TR-iBRB2 using RT-PCR. In conclusion, conditionally immortalized retinal capillary endothelial cell lines were established from a transgenic rat harboring the temperature-sensitive SV 40 large T-antigen gene and these lines were shown to exhibit the properties of retinal capillary endothelial cells.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • ATP Binding Cassette Transporter, Subfamily B, Member 1 / analysis
  • Animals
  • Animals, Genetically Modified
  • Antigens, Viral, Tumor / analysis
  • Antigens, Viral, Tumor / genetics
  • Blood-Retinal Barrier*
  • Blotting, Western
  • Capillaries
  • Cell Division
  • Cell Separation
  • Endothelium, Vascular / pathology*
  • Genes, MDR
  • Glucose Transporter Type 1
  • Hot Temperature
  • Models, Animal
  • Monosaccharide Transport Proteins / analysis
  • Rats
  • Receptor Protein-Tyrosine Kinases / analysis
  • Receptors, Growth Factor / analysis
  • Receptors, Vascular Endothelial Growth Factor
  • Retinal Vessels
  • Reverse Transcriptase Polymerase Chain Reaction
  • Tumor Cells, Cultured*


  • ATP Binding Cassette Transporter, Subfamily B, Member 1
  • Antigens, Viral, Tumor
  • Glucose Transporter Type 1
  • Monosaccharide Transport Proteins
  • Receptors, Growth Factor
  • Slc2a1 protein, rat
  • Receptor Protein-Tyrosine Kinases
  • Receptors, Vascular Endothelial Growth Factor